1 files changed, 1 insertions, 0 deletions
diff --git a/nlsolve.c b/nlsolve.c
index 9366605..f81e701 100644
--- a/nlsolve.c
+++ b/nlsolve.c
@@ -21,6 +21,7 @@
 #include <errno.h>
 #include <limits.h>
 #include <math.h>
+#include <stddef.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>